I know almost all live studio shows will have a 'dirty' output along with something called a 'clean' output where a tape is made of the programme but without all graphics, bugs etc. What I'd like to know is how is this actually done in a Television gallery and will every gallery have it as standard? Is there a certain name for the machinery needed to record the clean output? Any help would be much appreciated, just looking to invest in some equipment at my work (no it's not the TV industry, but is media related)
I know almost all live studio shows will have a 'dirty' output along with something called a 'clean' output where a tape is made of the programme but without all graphics, bugs etc. What I'd like to know is how is this actually done in a Television gallery and will every gallery have it as standard? Is there a certain name for the machinery needed to record the clean output? Any help would be much appreciated, just looking to invest in some equipment at my work (no it's not the TV industry, but is media related)
Most "clean" recordings are made from an output prior to the downstream-keyer in the gallery vision mixer. The DSK is used mainly for supering "astons" etc. Almost any decent vision mixer will have pre-DSK outputs and it is these that are recorded.
You don't buy an "extra" bit of kit to do it - you just use the output that any half-decent vision mixer has as standard.
If you are upstream keying the graphics on an ME bank then a more sophisticated vision mixer is required to record a "clean" output - though it is still possible.
Most production vision mixers have more than one output. There will be the main output ('TX Out', or 'Main') which in a broadcast environment would be offered to transmission (or to tape). There would also be one or more additional outputs, referred to as 'cleans' or ISOs (short for isolated I assume!). In setting up the vision mixer, one can usually nominate what each ISO has as part of its signal. You could, for example, have one ISO perfectly clean of any downstream keys, but another with just name captions, but not a programme DOG. Sometimes, to confuse the issue, ISOs of a single camera's output will be required. Imagine a studio interview - a recording of the cut interview will be made, but sometimes ISO of the cameras offering the singles of the guest and interviewer will be made (sometimes with a clean audio feed of their mics too). This means in the event of having to edit the interview, the clean shots are available as well as the cut interview.
Most production vision mixers have more than one output. There will be the main output ('TX Out', or 'Main') which in a broadcast environment would be offered to transmission (or to tape). There would also be one or more additional outputs, referred to as 'cleans' or ISOs (short for isolated I assume!). In setting up the vision mixer, one can usually nominate what each ISO has as part of its signal. You could, for example, have one ISO perfectly clean of any downstream keys, but another with just name captions, but not a programme DOG. Sometimes, to confuse the issue, ISOs of a single camera's output will be required. Imagine a studio interview - a recording of the cut interview will be made, but sometimes ISO of the cameras offering the singles of the guest and interviewer will be made (sometimes with a clean audio feed of their mics too). This means in the event of having to edit the interview, the clean shots are available as well as the cut interview.
Hope this helps.
ISOs would normally be routed out via Vision Mixer AUX buses, or even done on a router separate to the vision mixer. The Vision Mixer clean output would normally be a source on the router as well.